code: def start_monitor_threads(checkers={}):
      """start the threads by checkers"""
      tasks = []
      for k, ch in checkers.items():
          ch._keep_running = True
          t = threading.Thread(
              target=ch.keep_running, args=(), name=k, daemon=True
          )
          t.start()
          tasks.append(t)
      return tasks
  
file_path: milvus/tests/python_client/chaos/chaos_commons.py
imports: import os
  import threading
  import time
  import glob
  from chaos import constants
  from yaml import full_load
  from utils.util_log import test_log
  from delayed_assert import expect
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: start_monitor_threads(checkers) and returns: tasks